copy an element from a pointed-to char array

[ftl25]

I have an array of strings as follows:

char *sCmdInt[8];

I need to use elements from the array to pass to another dll. The function takes two LPSTRs as parameters. What I need to do is copy two elements from the array into ints/longs, and then create two LPSTRs from those. I cannot pass the array elements directly, as this causes an access violation:

DIAG_ReadMem32(sCmdInt[1], sCmdInt[2]);

Any suggestions as to how to make totally independent copies? The values held in the array may be hex (can these be converted to int/long?)

Thanks

[Ancient Dragon]

There is no reason why this should not work, unless the function DIAG_ReadMem32 is attempting to change the contents of either of those pointers.

char *sCmdInt[8] = {0};
sCmdInt[0] = "123";
sCmdInt[1] = "234";
DIAG_ReadMem32(sCmdInt[0], sCmdInt[1]);

If the values in the array are hex numbers, such as "0x100", then you can use strtol() to convert them to integers

int x;
char str[] = "0x123";
char *ptr = 0;
x = strtol(str,&ptr, 16);

[ftl25]

The function does attempt to change the contents of the second parameter. How is this usually resolved?

[Ancient Dragon]

String literals can not be changed because most compilers put them into read-only memory. How to change that? Notice that you have to make each buffer large enough to hold whatever it is that DIAG_ReadMem32() wants to copy into it. If you don't know exactly how big to make it, take a guess then double it.

char sCmdInt[8][255] = {0};
strcpy(sCmdInt[0],"123");
strcpy(sCmdInt[1],"234");
DIAG_ReadMem32(sCmdInt[0], sCmdInt[1]);

[ftl25]

Is this the only resolution? Isn't is possible to make an independent copy of the value pointed to by sCmdInt[x]? sCmdInt is built up using the strtok function, which only returns pointers.

[Ancient Dragon]

Of course there are other solutions. And the one you suggested will work too. Just create another buffer and copy the contents of sCmdInt into it.